We have learned that valence bond theory helps us to predict s and p bonding in molecules. All of the following statements about molecular bonding are true, but which statement best summarizes the most basic premise for bonding in a molecule?

A) The SN value is very important for predicting bond behavior.

B) An atom always has to have at least one available orbital with one unpaired electron in order to form a bond.

C) The atomic number helps you to determine the electron configuration of an atom.

D) s and p bonds are the result of interactions between unpaired electrons.